Fastener



FIG. 1 is a perspective view of a fastener showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is another perspective view of FIG. 1 .

The broken lines within the drawings illustrate portions of the claimed design and form no part of the claimed design. The dot-dot-dash broken lines within the drawings define the bounds of the claimed design and form no part of the claimed design. 

CLAIM The ornamental design for a fastener, as shown and described. 